Fig. 6
9
ready to operate (Fig.6). Turn diopter measuring hand-wheel. When digitals
appearon the display screen, it indicates the device is put in mode of spherical
lens measurement.
Important Prompt
Be sure to install measurement bearing seat correctly, otherwise it will result in imprecise
measurement.
3.
Adjustment of ocular visibility. To obtain precise and reliable measuring result,
ocular visibility shall be adjusted before measurement. The method is:
observe black reticule digitals of eyepiece dividing plate 6 in eyepiece visual
field. At the same time, the better way is to turn eyepiece cover in one way
(one-way rotation can eliminate influence caused by action of eye adjustment)
until the black reticule digitals become clearest.
4.
Adjusting zero position of the device. Turn diopter measurement hand-wheel
to focus drone to clearest state. At this time, the display degree of spherical
lens is 0.00.
*5.
If a prism compensator is provided, make sure that display of prism
compensator is “0” before measurement. (Fig.7)
Fig. 7
Matters Needing Attention
*1.
If diopter of testee’s eye is deep or it has astigmatism, measurement shall be
carried out only after he (she) wears spectacles for correcting visual acuity.
